package lec07datastructure;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.PrintWriter;
import java.util.Scanner;


public class E {
    static Scanner cin = new Scanner(new BufferedInputStream(System.in));//大量输入优化版本
    static PrintWriter cout = new PrintWriter(new BufferedOutputStream(System.out));//大量输出优化版本
    static PrintWriter cerr = new PrintWriter(System.err, true);//开启调试模式,一般输出量不大，不需要buffered

    public static void main(String[] args) {
        //TODO AOJ开启你的ACM传奇人生
        cerr.println("----Start your ACM legendary life with AOJ(www.webturing.com)----");
        int q = cin.nextInt();
        Vector v = new Vector();
        while (q-- > 0) {
            int type = cin.nextInt();
            if (type == 0) {
                int x = cin.nextInt();
                v.pushBack(x);
            } else if (type == 1) {
                int p = cin.nextInt();
                cout.println(v.get(p));
            } else {
                v.popBack();
            }
        }
        cin.close();//关闭输入流
        cout.close();//关闭输出流，这是必须的，否则一般不会自动刷新缓冲区

    }

    static class Vector {
        int[] data = new int[200000 + 100];
        int size = 0;

        int get(int x) {
            return data[x];
        }

        void pushBack(int i) {
            data[size++] = i;
        }

        void popBack() {
            --size;
        }

    }
}
